ib4

An acronym meaning "In before...". Usually following some type of noun. Used on forums to state that someone is posting in the thread before something imminent.

Bob: God doesn't exist!
Joe: ib4 uber-religous christians

by Adam Piola October 16, 2007

ib4

ib4 means in before

Which you can also read about here: urbandictionary.com/define.php?term=in%20before

ib4 they lock up the rooms then lets get out!

by CrackjackxD July 20, 2017